Before I purchased these, I was using the generic $10-20 earbuds you can find in any store. I listen to music all the time, so I figured it was time to spend a little more and try something better. I ended up with these.
The earbuds are definitely different, since they go deep into the ear, and may be a little uncomfortable at first. But once you get them in properly, the noise isolation is awesome. The foam buds are decent as well.
As for the sound. . . there is no comparison to the cheap ones I was using before. At first, it was hard to tell the difference, but after a while of using them, I realized I could pick out every different instrument easily. There is amazing clarity to the music, and it was like I was listening to each song for the first time all over again.
That said, there is one downside to these. The bass. While you can pick out the bass clearly, it just sort of blends right into the other instruments. There is no real oomph! to it. If you're looking for some earbuds that'll reverberate bass inside your head, these are not them. However, if you're content with incredible sound otherwise, you'll be happy with these.